FACTOID # 57: In 2002, every 1000 Swedes made a bus.
 
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Encyclopedia > Catadioptric

Optical systems which involve both lenses and mirrors. Catadioptric systems are commonly used in telescopes and in surveillance systems to provide 360 degree views. See also list of optical topics. ... 50 cm refracting telescope at Nice Observatory. ... Surveillance is close monitoring of behavior. ...



 

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